Modify a Recipient Policy

By default, one e-mail recipient policy, called the default
policy, is created for each domain in your Exchange 2000
organization. In addition, policies are created for each Exchange
Server 5.5 site for reverse compatibility. You can modify Exchange
2000 recipient policies to meet the needs of your organization,
reduce network traffic, and more efficiently use disk space usage.
However, you cannot modify or delete default policies created for
Exchange 5.5 sites.